When people are not responsible for their own lives and happiness it can hurt those that love them by putting a burden on them – a burden that is not theirs.
We cannot give others happiness, security, stability, health, etc. – they have to find it in themselves. When we try to give them these things it can stunt them and create a co-dependent situation where that person relies on us for everything. It doesn’t do any good for either party and usually results in a toxic relationship.
It’s not to say to never help anyone, but if it’s a situation where the person never helps themselves, it may be best to let them figure it out on their own. Even letting a person hit rock bottom, because that is when they’ll find the strength to do it on their own because they won’t want to ever feel that way again.